[DeTomaso] Ford 392 rev limit?

[bill gaino]

Too many variables...valve train is the slow part. He'll, I shift at 6200

-----Original Message-----
>From: shawkins777 at comcast.net
>Sent: Sep 5, 2013 8:17 PM
>To: Julian Kift <julian_kift at hotmail.com>
>Cc: "MikeLDrew at aol.com" <mikeldrew at aol.com>, De Tomaso List <detomaso at poca.com>
>Subject: Re: [DeTomaso] Ford 392 rev limit?
>
>Depends on what his crank is made of also. 
>
>Steve 
>
>----- Original Message -----
>From: "Julian Kift" <julian_kift at hotmail.com> 
>To: "MikeLDrew at aol.com" <mikeldrew at aol.com>, "De Tomaso List" <detomaso at poca.com> 
>Sent: Thursday, September 5, 2013 4:26:08 PM 
>Subject: Re: [DeTomaso] Ford 392 rev limit? 
>
>An engine builder once told me to use a rule of thumb limit of 4,000 fpm piston speed, which assuming you have a 4.030 bore by 3.85 stroke would equate to setting the rev limiter at 6,200, so looks like you are about right. 
>
>Julian 
>
>> From: MikeLDrew at aol.com 
>> Date: Wed, 4 Sep 2013 22:40:10 -0400 
>> To: detomaso at POCA.com 
>> Subject: [DeTomaso] Ford 392 rev limit? 
>> 
>> Hi guys, 
>> 
>> During the dark days when the forum was down, Jeff Cobb posted a query and 
>> it was rejected, so he asked me to post it for him (below). There are 
>> actually two posts--start at the bottom one and work your way up. 
>> 
>> Mike 
>> 
>> ==== 
>> 
>> From: JEFFREY COBB <zumzum at cox.net> 
>> Subject: Re: 351 rev limit 
>> Date: August 29, 2013 1:54:13 PM CDT 
>> To: "detomaso at poca.com List" <detomaso at poca.com> 
>> Cc: Jeff Cobb <zumzum at cox.net> 
>> 
>> Hello again about the rev limit question, 
>> The engine specs are: 
>> Ford Racing 392 Windsor stroked, 
>> 360 hp at rear wheels from the dyno sheet 
>> GT40 Heads--9.7:1, 
>> Mighty Demon 750 
>> Ford Racing steel flywheel 
>> Tremac TKO 3550 5 speed and 3.73, 
>> 
>> Any help would be appreciated, 
>> Thanks, 
>> Jeff 
>> _________________________________________________________________________ 
>> On Aug 29, 2013, at 6:13 AM, Jeff Cobb wrote: 
>> 
>> 
>> Hello group, 
>> 
>> 
>> 
>> 
>> 
>> Hope you all can provide info. 
>> 
>> 
>> A 2000 Superformance Cobra came back in yesterday for some finish up work 
>> while I was tuning up a 57 Ford Fairlane Skyliner with a Police Interceptor 
>> 392 engine. 
>> 
>> 
>> Just bought by a faithful customer and he wants me to do what I want to do 
>> to make it better and faster. 
>> 
>> 
>> 
>> 
>> 
>> My question to you guys is about the safe rev limit. It has a 351 taken out 
>> to a stated 392, the largest Demon carb I've ever seen and a MSD 6AL with a 
>> 6100 rpm limit chip. 
>> 
>> 
>> 
>> 
>> 
>> Problem is that this strong engine will instantly bang off the limiter too 
>> quickly in the first three gears. Engine is very smooth at high rpm's and 
>> feels as if it would rocket well past past 6,100 with no problem. 
>> 
>> 
>> 
>> 
>> 
>> I do not know cam, rear end ratio, compression or any other specs and I 
>> will try to find out today. Torque peak feels the strongest about 3,000 to 
>> 4,100 with 6,1000 coming in too soon. 
>> 
>> 
>> 
>> 
>> 
>> What rpm limiter chip do you all recommend for what I have described? 
>> 
>> 
>> I have little history with higher rpm ceilings of large FORD engines. 
>> 
>> 
>> Owner is a 64 year old just math professor hot rodder who drives little and 
>> want to have fun before his last personal rev limit. 
>> 
>> 
>> We don't desire to scatter his engine and he might buy and use some of my 
>> VP 110 leaded race gas which will also help. 
>> 
>> 
>> 
>> 
>> 
>> Thanks for any input, 
>> 
>> 
>> 
>> 
>> 
>> Jeff Cobb 
>> _______________________________________________ 
>> 
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>> 
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>
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